Windows 10 users finding their legit installs are being deactivated

For reasons that are currently unclear, Windows 10 Professional users are finding that their properly licensed installations are being deactivated.

On systems affected by the issue, Windows is complaining that a Windows 10 Home license key is being used with a Windows 10 Pro installation. To fix things, the system needs to be wiped and Windows 10 Home installed. Otherwise, a genuine Windows 10 Pro key needs to be used.

Microsoft has acknowledged that the problem exists and that some unspecified issue with the Windows Authentication servers is causing the problem, but as yet, there’s no fix. The Windows 10 Pro licenses do seem to be valid, and some resolution is promised within a couple of business days.